lobstr provides tools in the same vein as str(), which allow you to dig into the detail of an object.
Install the released version of lobstr from CRAN:
install.packages("lobstr")
You can install the development version with:
# install.packages("pak")
pak::pak("r-lib/lobstr")
ast() draws the abstract syntax tree of R expressions:
ast(a + b + c)
#> █─`+`
#> ├─█─`+`
#> │ ├─a
#> │ └─b
#> └─c
ast(function(x = 1) {
if (x > 0) print("Hi!")
})
#> █─`function`
#> ├─█─x = 1
#> ├─█─`{`
#> │ └─█─`if`
#> │ ├─█─`>`
#> │ │ ├─x
#> │ │ └─0
#> │ └─█─print
#> │ └─"Hi!"
#> └─<inline srcref>
ref() shows hows objects can be shared across data structures by digging into the underlying __ref__erences:
x <- 1:1e6 y <- list(x, x, x) ref(y) #> █ [1:0x1063ac468] <list> #> ├─[2:0x11629ba38] <int> #> ├─[2:0x11629ba38] #> └─[2:0x11629ba38] e <- rlang::env() e$self <- e ref(e) #> █ [1:0x1068a2218] <env> #> └─self = [1:0x1068a2218]
A related tool is obj_size(), which computes the size of an object taking these shared references into account:
obj_size(x) #> 680 B obj_size(y) #> 760 B
cst() shows how frames on the call stack are connected:
f <- function(x) g(x) g <- function(x) h(x) h <- function(x) x f(cst()) #> ▆ #> 1. ├─f(cst()) #> 2. │ └─g(x) #> 3. │ └─h(x) #> 4. └─lobstr::cst()
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4